Was the idea that Fidel Castro ordered the assassination of JFK swept under the carpet?

If you have been paying attention, you will know that I have been re-reading books from my modest library, as I can’t get to the public one. And I avoid buying books if I can. If I buy them at all, it is preloved or pre-hated stuff, as cheaply as possible. The choice is bottomless, but the library is still my preferred option.